When does a car need an AdBlue top-up?

I own a 2022 VW Touareg which has covered 16,000 miles. I still haven't put any AdBlue in the tank and haven't had any warnings on the dash either. Is this normal?

Do you recommend buying a high mileage diesel?

I'm looking to buy a diesel car, most likely from 2014. What is considered high mileage for these? It will most likely be a BMW or Audi, which are usually ex-fleet cars. Do you recommend buying a high...

Does the AdBlue range change depending on driving style?

I recently bought a used 2017 Mercedes GLC and I noticed that the AdBlue gauge doesn’t seem to change from 3100 miles although I have driven about 500 miles since I last checked. Is this a fault or does...